tremor of unknown cause (usually of the hands and head) that develops in older people; often mistaken for Parkinsonism but is not life-threatening and can usually be kept under control
absolutely necessary; vitally necessary
basic and fundamental
of the greatest importance
anything indispensable
defining rights and duties as opposed to giving the rules by which rights and duties are established
an involuntary vibration (as if from illness or fear)
a small earthquake
shake with seismic vibrations
shaking or trembling (usually resulting from weakness or stress or disease)
